Japanese · Pronunciation Guide
ji-bu-n, three beats — a soft palatal j and a closing nasal that takes a whole count.
jibun
Three slots, the last with no vowel in it. English delivers two syllables here and loses a third of the word's length. The fix is unglamorous: hum the closing nasal deliberately, giving it as much time as the ji or the bu.
Listen: 自分
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自分の部屋で勉強します。
Jibun no heya de benkyou shimasu.
I study in my own room.
Listen: 自分の部屋で勉強します。
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自分の部屋で勉強します contains 勉強 (be-n-kyo-o), four morae with a nasal beat and a long vowel, and 部屋 (he-ya) with two short ones. The sentence therefore has two moraic nasals plus a held vowel — three beats that English intuition would not count at all.
"JEE-boon" is the standard English rendering: a hard j, a stretched stressed first vowel, rounded lips on the u, and the nasal reduced to a closing consonant. Soften the j to a blade articulation, halve the i, spread the lips, and hold the ん for its own beat.